Commentary for Genesis 46:7

ובנות בניו HIS SON’S DAUGHTERS — these were Serah, the daughter of Asher, and Jochebed, the daughter of Levi.

AND HIS SONS’ DAUGHTERS. These were Serah, the daughter of Asher, and Jochebed, the daughter of Levi. This is the language of Rashi. But what will Rashi include in the term, his daughters, [which is also plural, although Jacob only had one daughter, Dinah]? Rather, it is the way of Scripture, when mentioning the genealogy of many people, to refer to an individual in the plural form, as for example, And the sons of Dan: Hushim;¹⁸¹Verse 23 here. And the sons of Palu: Eliab.¹⁸²Numbers 26:8. The same is true here: “daughters” refer to Dinah. “His sons’ daughters” refers to Serah the daughter of Asher, but Jochebed [Moses’ mother] is not mentioned by Scripture [as being among the persons who went down to Egypt], as it is said, All the souls were threescore and six.¹⁸³Verse 26 here. She is, however, hinted at, according to the opinion of our Rabbis.¹⁸⁴Baba Bathra 123a. See also Ramban, next Verse.

בניו ובני בניו אתו, his sons and grandchildren with him, etc. Since we have been told in the previous verse that Jacob arrived in Egypt with all his descendants, why did the Torah have to tell us that he took his children and grandchildren with him?